 Blends of a propylene/.alpha.-olefin copolymer with isotactic prolypropylene |
| According to this invention there is provided a composition consisting essentially of a blend of an ... |
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| Acrylic multilayer polymer powder |
| In light of these circumstances, the present inventors studied the structures of coagulated powders ... |
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| Process for extrusion |
| We claim: 1. A process for the co-extrusion of an inner layer around a conductive medium and an ... |
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| Olefine thermoplastic elastomer sheet |
| OF THE INVENTION The present invention is described in more detail. First, the olefin ... |
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| Coextruded chewing gum containing a soft non-SBR gum core portion |
| What is claimed is: 1. A coextruded chewing gum having a soft gum center portion, comprising an ... |
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| Aqueous dispersion of polymer composition |
| We claim: 1. An aqueous dispersion of a polymer composition comprising (A) a copolymer which ... |
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| Thermoplastic polymer blends comprising EPDM and EP |
| The thermoplastic polymer blends of this invention comprise a physical mixture of two polymer ... |
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Polypropylene closure with removable liner
| Details |
Inventors: Schloss, Francis M.;
Assignee: Owens-Illinois Closure Inc. (Toledo, OH)
Primary Examiner: Norton; Donald F.
Assistant Examiner:
Attorney, Agent or Firm:
A polypropylene compression molded closure with an elastomer liner that is removable, the elastomer being a blend of polyethylene and a rubbery copolymer, containing oil. |
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DETAILED DESCRIPTION OF THE INVENTION In the drawings, a compression molded polypropylene closure or cap 5 is shown, the closure having an inside top surface 10.
An elastomeric liner 20 is provided, the liner having a surface 25 that is adjacent the closure top surface 10 when the closure is assembled.
The liner 20 is removable without damage as shown in FIG.
1.
The polypropylene closure is preferably compression molded with a compression molded elastomeric liner that is a blend of generally about 20 to 60 wt.
% and preferably about 30 to 50 wt.
% polyethylene and generally about 40 to 50 wt.
% and preferably 50 to 70 wt.
% of the rubbery copolymer.
The rubbery copolymer blend generally contains about 20 to 50 wt.
% mineral oil or petroleum oil.
The best results are obtained generally when the polymer blend, exclusive of oil, is about 40 wt.
% polyethylene and 60 wt.
% copolymer.
As to the oil, about 40 wt.
% oil generally provides the best results.
The copolymerizable monomer for the styrene of the elastomer of the blend is preferably butadiene, although isoprene and ethylene butylene can be used to provide benefits of the invention.
The rubbery copolymer can be a copolymer of ethylene and propylene.
The elastomeric copolymer is preferably a block copolymer of styrene and butadiene or hydrogenated butadiene or ethylene butylene.
A suitable block copolymer is a copolymer material Kraton-G.
TM.
sold by Shell.
A suitable block copolymer is one of styrene and butadiene, for instance, prepared by anionic polymerization.
The copolymers are thermoplastic rubbers, showing the behavior of vulcanized elastomers at room temperature with hard chain length blocks of styrene acting similarly to crosslinks to prevent creep in the polybutadiene block matrix.
At higher temperatures, they undergo normal plastic flow.
The butadiene component of the copolymer can be replaced by isoprene or ethylene butylene as, for instance, is available as Kraton.
RTM.
rubber materials including 1102 and 1107 from Shell Chemical
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Adhesives and Rubbers 
